"Classroom Mineral Specimens"

Feldspar group; greenish gray alkali feldspar, coarse crystalline, some iridescence.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Cut black mica cleavage sheets.

Pyroxene group; dark green, pure cleaved fragments.

Pure translucent to white, rhombic cleavages, Mohs’ hardness of 3.

Crystals and crystal sections up to 1", Mohs’ hardness of 9.

Deep blue, massive, with nepheline; key feldspathoid.

White, fine, massive, opaque to slightly translucent.

White, fibrous, silky luster.

Fresh Green forsterite, classic “twin sisters” dunite.

Amphibole group; black, coarse, massive.

Feldspar group; calcium end member plagioclase crystals in pyroxene matrix.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Amphibole group; dark greenish black cleavages, somewhat columnar.

Cleaned, pure, bright, metallic native copper.

Pure, white, earthy “China clay”.